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nvmf/vfio-user: calculate MDTS based on transport iovcnt

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This will ensure that we can't exceed the iovcnt when parse
NVMe PRP list to req->iov.

Also comment that the iovcnt in vfio-user transport is used to track
each gpa_to_vva map, for NVMe PRP list command, the PRP2 itself also
will use one entry, so we need add one more entry for this case.

Fix issue #1864.

Change-Id: I06c7137e2c4637c9501f82a9eb1c8e4395d819cd
Signed-off-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/7264
Community-CI: Broadcom CI
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: <dongx.yi@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Changpeng Liu 2021-04-07 21:54:26 +08:00 committed by Tomasz Zawadzki
parent bc279db48a
commit b163a88715
1 changed files with 5 additions and 4 deletions
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9
lib/nvmf/vfio_user.c
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@ -55,8 +55,8 @@
#define NVMF_VFIO_USER_DEFAULT_AQ_DEPTH 32
#define NVMF_VFIO_USER_DEFAULT_MAX_QPAIRS_PER_CTRLR 64
#define NVMF_VFIO_USER_DEFAULT_IN_CAPSULE_DATA_SIZE 0
#define NVMF_VFIO_USER_DEFAULT_MAX_IO_SIZE 131072
#define NVMF_VFIO_USER_DEFAULT_IO_UNIT_SIZE 131072
#define NVMF_VFIO_USER_DEFAULT_MAX_IO_SIZE ((NVMF_REQ_MAX_BUFFERS - 1) << SHIFT_4KB)
#define NVMF_VFIO_USER_DEFAULT_IO_UNIT_SIZE NVMF_VFIO_USER_DEFAULT_MAX_IO_SIZE
#define NVMF_VFIO_USER_DEFAULT_NUM_SHARED_BUFFERS 512 /* internal buf size */
#define NVMF_VFIO_USER_DEFAULT_BUFFER_CACHE_SIZE 0
@ -73,8 +73,8 @@ struct nvmf_vfio_user_qpair;
typedef int (*nvmf_vfio_user_req_cb_fn)(struct nvmf_vfio_user_req *req, void *cb_arg);
#define NVMF_VFIO_USER_MDTS 32
#define NVMF_VFIO_USER_MAX_IOVECS (NVMF_VFIO_USER_MDTS + 1)
/* 1 more for PRP2 list itself */
#define NVMF_VFIO_USER_MAX_IOVECS (NVMF_REQ_MAX_BUFFERS + 1)
struct nvmf_vfio_user_req {
struct spdk_nvmf_request req;
@ -85,6 +85,7 @@ struct nvmf_vfio_user_req {
nvmf_vfio_user_req_cb_fn cb_fn;
void *cb_arg;
/* placeholder for gpa_to_vva memory map table, the IO buffer doesn't use it */
dma_sg_t sg[NVMF_VFIO_USER_MAX_IOVECS];
struct iovec iov[NVMF_VFIO_USER_MAX_IOVECS];
uint8_t iovcnt;